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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2017
Operating Loss Carryforwards [Line Items]        
Income tax benefit due to the re-measurement of its net U.S. deferred tax liabilities due to the Act     $ 1,700  
Increase (decrease) in valuation allowance $ 1,000 $ 100 7,300  
Cumulative undistributed foreign earnings 97,200      
Tax positions related to a prior period 6,219 $ 4,993 $ 5,787 $ 7,520
Deferred tax assets related to operating loss carryforwards, not recorded 3,600      
Federal and Foreign        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards 208,400      
State        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards 26,900      
Tax credit carryforwards 3,600      
Indefinite-Lived Carryforwards        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforwards 2,300      
Federal        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforwards 5,700      
Other Noncurrent Liabilities        
Operating Loss Carryforwards [Line Items]        
Tax positions related to a prior period $ 2,600